Network, generic

U014C Lost Communication With Battery Energy Control Module D

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

U014C is the fourth slot in the battery controller family and points at module D. Such a letter is only needed where a pack is split into many sub-packs with their own monitoring boards, or where a vehicle carries an extra battery, for example a second traction pack or a separate 48 V unit, each reporting to a master controller. The master or the hybrid controller logs U014C once D's frames stop. No manufacturer explains the code publicly. As a guide, GM rates the comparable U0111 for module A as a Type B fault in its 2018 hybrid tables after a 500 ms gap, so a MIL is plausible here too. While D is silent, its cells cannot be supervised; the system will usually cut power, open contactors or refuse charging to stay safe. U0111, U0112 and U014A cover modules A to C.

Likely causes

Supply or ground of battery module D missing
Internal pack communication line or connector to D faulty
Battery module D internally faulty
Master controller configured for a module D that does not match

Symptoms

  • Battery or hybrid system warning
  • Reduced drive power or no ready mode
  • Charging not possible

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

battery energy module dcan bus

Related codes

U0111U0112U014A

References: gsi.ext.gm.com, en.wikipedia.org, law.cornell.edu.